Place the chicken breast, salsa, cumin, chili powder, garlic powder, sea salt, and black pepper in the slow cooker.
Cook on low for 6 to 7 hours or on high for 3 to 4 hours until the meat is tender and easy to pull apart.
Remove the chicken and shred it with two forks, then return it to the slow cooker to soak up the savory juices.
In a large skillet over medium heat, lightly sauté the cauliflower rice until tender, then stir in the cooked brown rice.
Assemble the bowls by layering the rice mixture, shredded chicken, sliced bell peppers, and diced red onion.
Top each bowl with the avocado, fresh cilantro, and a squeeze of lime juice.